“The costings therefore remain accurate. The completion time of the project remains the same.

“The profile of the expenditure has been adjusted to push $5 million into the year in which the project is completed — 2018-19.”

That means the missing spending falls outside the forward estimates and is not included anywhere in the costings released today by Labor.

Earlier, Mr Weatherill said his campaign spend of $670 million, which includes the $240 million of spending on the O-Bahn and electric rail, was more than offset by $689 million in savings.

“There is only one way that the Liberals’ costings add up and that is with deep cuts,” he said.

“Cuts that will be revealed after the election when an unelected audit commission meets to consider what should be cut. News_Rich_Media: In the last debate of the campaign, South Australian Premier Jay Weatherill argues with Opposition Leader Steven Marshall about the state's budget.

News_Image_File: Attorney General John Rau and Premier Jay Weatherill announce plans for a new $5.3 million police station at Henley Beach. Picture: Roger Wyman

“I am calling on Steven Marshall to be upfront with the South Australian community about his real plans and immediately release full four-year costings.”

Labor’s costings forecasts the final Budget result in the 2013-14 year to be a $1 billion deficit and the state to remain in the red in 2014-15 when a $576 million deficit is delivered.

Surpluses of $230 million are expected in 2016 and $564 million in 2017.

Both forecast surpluses are higher than were anticipated in December’s Budget update.

General government debt is to peak at $9.7 billion in 2016, slightly worse than expected in the update, and improve to $9.1 billion in 2017. News_Image_File: Premier Jay Weatherill and Liberal Leader Steven Marshall cook up some election promises on the campaign trail. Picture: Roger Wyman

FEWER computer servers across government and use of more laptops, to save $4.1 million.

Mr Weatherill’s costings have been compiled using Treasury forecasts but not independently audited. Mr Marshall has pledged an independent audit from a firm formerly used by Labor.

Mr Weatherill warned the Opposition’s post-election razor gang would recommend savings similar to unpopular measures reportedly being considered by the Federal Government.News_Image_File: Liberal Leader Steven Marshall tours a factory at Melrose Park.

He dismissed suggestions Labor’s planned savings were evidence of waste in government.

“Every year, in the 12 years of this government, substantial savings have been made in the efficiency of government,” Mr Weatherill said. “There has not been a Budget brought down by this government that hasn’t involved efficiencies every year.

“These (savings) are going to be difficult to achieve. We think they are only going to be achieved over a period of time. We’ve accepted conservative estimates.”

Mr Marshall said the Government and Opposition both released their costings on the Thursday of the final week of the 2010 election campaign and he planned to follow that example.

“We’ve got a very robust mechanism in place,” he said “Our numbers are being checked.

“The premier’s credibility in this area is in complete and utter tatters.”

Opposition treasury spokesman Iain Evans said Labor’s costings had only been “signed off by spin doctors” and could not be trusted.

“There is no reason for South Australians to believe this costings document. It hasn’t been independently signed off,” he said.

“With a record deficit and a record debt, why wouldn’t the Government get an independent expert to sign off on the costings document unless it had something to hide?”

Mr Evans said it appeared there was “at least a $5 million error” related to Flinders Medical Centre.

He said the Opposition would consider tonight if it would adopt any of Labor’s savings.

Meanwhile, Federal Assistant Infrastructure and Regional Development Minister Jamie Briggs questioned Labor’s claim it will make a $100 million saving from “unallocated” Nation Building funding.

The program is administered by the Federal Government and co-funds state infrastructure builds including the upgrades to South Rd and past public transport upgrades.

Mr Briggs told The Advertiser Mr Weatherill could not simply pocket the money as a saving.

“We are the ones that make decisions on the expenditure of Commonwealth money, state governments don’t. We negotiate and work out arrangements, but to include it in the costings document is being extraordinarily misleading,” he said.

Mr Briggs said when there was unallocated funding for Nation Building programs it was common practice for the state and federal government to agree to a use for project savings.

Asked today where the unallocated funding was coming from and if it could simply be pocketed by the State Government, Mr Weatherill said: “This is our funding”.

“This is funding that we allocate. There’s also obviously Commonwealth funding that needs to match the funding that we provide but it allows us within the envelope, which is a very substantial envelope, to achieve the objectives.”

Mr Weatherill said those objectives included electrifying rail to Salisbury, delivering the Torrens to Torrens South Rd upgrade and starting work on the Darlington interchange.

He said it was essentially contingency funding.

Mr Weatherill’s office said the funding had been put aside in the Budget pending agreement for the Federal Government on new projects that now appeared unlikely.

State funding to meet demands in Mr Weatherill’s post-Holden jobs plan were still included in the Budget, a spokesman said.